Egbert baekley axd lewis semple



YUNITED i STATES i PATENT OFFICE.

ROBERT 'BABKLEY AND LEWIS SEMPLE, OF PHILADELPHIA, PA.'

GRINDSTONE-DRESSER.

Specification forming part of Letters Patent No. 42,738, dated May 17, 1864.

T0 all whom it may concern,.-

Be it known that we, ROBERT BARKLEY and LEWIS SEMPLE, both of Philadelphia, Pennsylvania, have invented an Improved Grindstone-Dresser; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object 'of our invention is the production of a more simple, cheap, and durable hand-tool for effectively dressing or truing 7 either the face or the sides of grindstones.

Our invention consists of a handle carrying a wheel of cast-iron with angular chilled teeth, the whole being constructed and applied to the dressing of grindstones, substantially as described hereinafter.

In order to enable others to make and use our invention, We will now proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this specification, Figure 1 is a side view of our improved grindstonedresser, and Fig. 2 a plan view of the same.

A is a handle of suitable dimensions for being grasped by both hands of the operator, and one end of this handle is forked for the reception of a Wheel, B, which has on its periphery angular transverse teeth a, a detachable pin, b, passing through the wheel as well as through the forked end of the handle.

The wheel is made of castiron, the teeth being hardened by what is technically termed a chilled mold, so that the points of the teeth may resist the triturating action of the stone,`

and remain in a sharp condition for a long time.

In using the instrument we prefer the assistance ot' a plate, D, which is secured to the frame-work E of the grindstone by bolts passing through slots on the plates, so that the latter can be adjusted longitudinally on the frame. y

The instrument is held in the angular position seen in Fig. l, a shoulder, x, near the forked end of the handle, resting against the beveled edge of the plate D, and the angular teeth of the wheel B bearing directly against the periphery of the grindstone, which is represented by the red line y.

As the grindstone rotates, a rapid rotary motion is imparted to the wheel B, the teeth of which break or chip small pieces from the stone, to which a true surface, and one best adapted for grinding purposes, is soon imparted. As the periphery vof the grindstone is reduced, the outer end of the handle may be depressed, thus causing the wheel to bear with more or less force against the stone until the desired grinding-surface has been attained.

By the constant use of the Wheel in the same position the teeth are apt to be worn round on one side, but to preserve their sharpness on the other; hence it is advisable to reverse the instrument from time to time, so that sharp edges of the teeth may be presented to the stone. In order to do this effectually, it will be advisable to form a shoulder, x, on both sides of the handle.

Instead of the plate D, a simple bar may be placed across the frame-Work E of the grindstone and used as a support for the instrument.

In dressing the sides of the stone the tool is held and operated in the same manner as in dressing the face.

We are aware that a patent was granted to John F. Schuyler, June 5, 1860, for a tool for the same purpose, consisting of a stem supporting a dressing-wheel composed of a series of radiating chisels situated between two yielding Washers but as this construction of the wheel is difficult and expensive, and also very liable to fracture in use, a more simple and inexpensive tool and of greater strength is required, especially as the dressing of the stones in large factories is generally left to the care of unskilleddaborers. The wheel B of our dressing-tool, being cast solid in a chilling-mold, is therefore 4much cheaper and more easily and expeditiously made. It is not liable to fracture in use, and consequent-ly'does not need the addition of yielding Washers, and can be legitimately used by the most unskilled laborer without any danger of his breaking it.

Having thus fully described our improvement and pointed out its utility, what We claim as new therein of our invention, and desire to secure by Letters Patent, is-

A hand-tool, consisting of the solid cast-iron wheel B, having chilled angular teeth, as de names to this specification in the presence 0f scribed, in combination with the forked huntwo subscribing Witnesses.

dle A, provided with a shoulder, w, on either i ROBERT BARKLEY. one or both of its sides, the whole being con- LEWIS SEMPLE. struoted and combined together as described, Vitnesses: for the purpose speoied. HENRY IIOWSON,

In testimony whereof We have signed our CHARLES HOWSON. 

